DAS 1221, Руководство по установке, Страница: 16 / 21

Panel AA Backup Batteries
This Panel includes four AA batteries to provide at least 12 hours of operation in the event of the loss of
all AC and DC power. The batteries are high-capacity rechargeable Nickel Metal Hydride (NiMH) type,
manufactured by Tenergy (Model 90430) and should replaced at least every 5 years. They are low-cost
and are available from AMAZON. Typically, the best practice is to replace them annually when the rest
of the DAS is tested. For the backup batteries to operate, DC primary power must be on first. After that,
the battery power will cut in automatically if primary DC power on J10 is lost.
There is an internal charger that keeps the batteries fully charged. The Panel includes a low voltage
cutoff switch that disconnects the battery if it drains beyond a preset level. Once the batteries reach
this level it typically requires 24 hours to recharge. If the batteries are not installed or are drained, an
alarm is generated indicating Panel trouble. An indicator LED inside the Panel illuminates BLUE when
the Panel primary power is off and the batteries are providing power. There is an LED on the PC board
attached to the back of the door and next to the battery holder. It flashes RED if the batteries are dead
or need to be installed.
If the AA batteries are lost, defective or not immediately available to be replaced, DIP SW1-9 can be set to
ON to turn off the monitoring of these batteries, silence the buzzer and turn off the Panel Trouble LED on
the front panel. In some jurisdictions, the Panel’s AA backup batteries are not required if the Panel’s DC
power is provided directly from the DAS Backup Battery Unit (BBU). In this case, DIP Switch SW1 position
9 can be permanently set to ON and no AA batteries need to be installed.
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